WO2021139093A1

WO2021139093A1 - Multi-path resonant conversion circuit and multi-path output control method based on same

Info

Publication number: WO2021139093A1
Application number: PCT/CN2020/096931
Authority: WO
Inventors: 毛昭祺; 王纪周; 柯乃泉
Original assignee: 毛昭祺
Priority date: 2020-01-08
Filing date: 2020-06-19
Publication date: 2021-07-15
Also published as: CN111162660A

Abstract

Disclosed in embodiments of the present application are a multi-path resonant conversion circuit and a multi-path output control method based on same. A control circuit in the circuit is used for controlling the working frequency of a first switching tube and the working frequency of a second switching tube, so that the sum of the sum of first electric signals output by a first output end and the sum of second electric signals output by a second output end is equal to a total value of preset electric signals; and the control circuit is further used for controlling the duty ratio data of the first switching tube and the duty ratio data of the second switching tube, so that the ratio of the sum of the first electric signals output by the first output end to the sum of the second electric signals output by the second output end is equal to a preset electric signal ratio. The working frequency of the first switching tube and the working frequency of the second switching tube are controlled by means of the control circuit, so that the first output end and the second output end constantly output electric signals according to the preset ratio, the total value of the output electric signals is equal to the total value of the preset electric signals, and the technical effect of simultaneous multi-path output of a same driver can be achieved.

Description

A multi-channel resonance conversion circuit and a multi-channel output control method based on the multi-channel resonance conversion circuit

Technical field

The invention relates to the field of resonant converters, in particular to a multiple-channel resonant converter circuit and a multiple-channel output control method based on the multiple resonant converter circuit.

Background technique

Light-Emitting Diode (LED, light-emitting diode) products have the advantages of energy saving, environmental protection, long life, high conversion rate, etc., and are widely used in the field of lighting. The LED converter converts the input AC power into DC power and supplies it to the LED load. There are two main types of LED converters on the market, one is an LED driver that outputs a constant current, and the other is an LED driver that outputs a constant voltage.

At present, the design requirements for LED drivers are becoming more and more stringent, and it is necessary to reduce the size of the driver under the premise of ensuring the working efficiency of the LED driver. Therefore, in order to meet the demand for miniaturization of the driver, a resonant converter is added to the circuit design of the LED driver, and the resonant soft switching technology is used to reduce the loss of the switching tube and increase the switching frequency of the switching tube. In some lighting situations, there are situations where the same driver needs to be used to drive two or multiple loads at the same time. In the prior art, multiple non-isolated DC conversion circuits are added to the rear stage of the resonant converter to cope with the use of the same driver. Drive two or multiple loads at the same time. Although this method can achieve multiple outputs, the circuit is complicated and the design cost is high.

Summary of the invention

The embodiment of the present application provides a multi-channel resonant conversion circuit, wherein the circuit includes: a first switch tube, a second switch tube, a resonance circuit, a transformer, at least one output circuit group, and a control circuit;

The first switching tube is connected to the second switching tube, and both the first switching tube and the second switching tube are connected to the resonance circuit;

The transformer includes a primary winding and at least one secondary winding pair, the primary winding is connected to the resonance circuit, and at least one secondary winding pair is connected to at least one output circuit group;

Each output circuit group in the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal;

The third output terminal is connected with the control circuit;

The control circuit is respectively connected with the first switch tube and the second switch tube, and the control circuit is used to control the working frequency of the first switch tube and the working frequency of the second switch tube, so that the sum of the first electrical signals output by the first output terminal The sum of the second electrical signal output from the second output terminal is equal to the total value of the preset electrical signal, and the control circuit is also used to control the duty cycle data of the first switch tube and the duty cycle data of the second switch tube. The magnitude is such that the ratio of the sum of the first electrical signals output by the first output terminal and the sum of the second electrical signals output by the second output terminal is equal to the preset electrical signal ratio.

Further, the control circuit includes: a drive generation circuit, a voltage-controlled oscillation circuit, a duty cycle control circuit, and an operational amplifier circuit;

The operational amplifier circuit is connected to the voltage-controlled oscillation circuit, and the operational amplifier circuit is used for the preset total value of the electrical signal according to the sum of the first electrical signal output from the first output terminal and the sum of the second electrical signal output from the second output terminal The difference value determines the feedback electrical signal;

The voltage-controlled oscillation circuit is connected to the drive generating circuit, and the voltage-controlled oscillation circuit is used to generate a frequency control signal according to the feedback electrical signal;

The drive generating circuit is used to control the operating frequency of the first switching tube and the operating frequency of the second switching tube according to the frequency control signal;

The duty ratio control circuit is connected to the drive generating circuit, and the duty ratio control circuit is used to generate the duty ratio control signal;

The drive generating circuit is also used to control the duty cycle data of the first switch tube and the duty cycle data of the second switch tube according to the duty cycle control signal, thereby controlling the sum of the first electrical signal output by the first output terminal and the second The ratio of the sum of the second electrical signals output by the output terminal is such that the ratio is equal to the preset electrical signal ratio.

Further, the resonance circuit includes an inductor and a capacitor;

The second end of the first switch tube or the first end of the second switch tube is sequentially connected to the inductor, the primary winding, the capacitor, and the second end of the second switch tube to form a half-bridge circuit.

Further, each secondary winding pair in the at least one secondary winding pair includes a first secondary winding and a second secondary winding;

Each output circuit group in the at least one output circuit group includes a first half-wave rectifier circuit and a second half-wave rectifier circuit. The first half-wave rectifier circuit is connected to the first secondary winding, and the second half-wave rectifier circuit is connected to the second half-wave rectifier circuit. Side winding connection;

The positive terminal of the first half-wave rectifier circuit is the first output terminal, the positive terminal of the second half-wave rectifier circuit is the second output terminal, the negative terminal of the first half-wave rectifier circuit is connected to the negative terminal of the second half-wave rectifier circuit and Grounded, the negative terminal of the first half-wave rectifier circuit is connected to the negative terminal of the second half-wave rectifier circuit to lead to a third output terminal.

Further, each output circuit group in the at least one output circuit group further includes a detection resistor;

The first end of the detection resistor is connected with the negative end of the first half-wave rectifier circuit, the first end of the detection resistor is connected with the negative end of the second half-wave rectifier circuit, and the second end of the detection resistor is connected with the third output end.

Further, the circuit includes N output circuit groups, the transformer includes N secondary winding pairs, and the N output circuit groups correspond to the N secondary winding pairs one-to-one; N is an integer greater than or equal to 2, and N output circuit groups Including N-1 adjacent output circuit groups, and including 2 (N-1) shunt inductor groups.

Further, the shunt inductor group includes a first shunt inductor and a second shunt inductor; the adjacent output circuit group includes a first output circuit group and a second output circuit group;

The first shunt inductor is located in the first half-wave rectifier circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is located in the second output circuit of the adjacent output circuit group corresponding to the shunt inductor group In the first half-wave rectifier circuit of the group; or; the first shunt inductor is located in the second half-wave rectifier circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is located in the shunt inductor group Corresponding to the second half-wave rectifier circuit of the second output circuit group of the adjacent output circuit group.

Further, the sum of the first electrical signal output by the first output terminal of each output circuit group in the at least one output circuit group and the second electrical signal output by the second output terminal of each output circuit group in the at least one output circuit group The ratio of the sum of the electrical signals is equal to the preset ratio of the electrical signals.

Correspondingly, the embodiment of the present application also provides a multiple output control method based on a multiple resonant converter circuit, the method includes:

Receiving the sum of the first electrical signal output by the first output terminal of each output circuit group in the at least one output circuit group and the sum of the second electrical signal output by the second output terminal of each output circuit group;

Determine the total value of the electrical signal according to the sum of the first electrical signal and the sum of the second electrical signal;

Adjust the operating frequency of the first switching tube and the operating frequency of the second switching tube according to the difference between the total value of the electrical signal and the total value of the preset electrical signal, so that the sum of the first electrical signal output by the first output terminal and the second output The sum of the second electrical signals output by the terminal is equal to the total value of the preset electrical signals.

Further, the above method also includes:

Receive duty cycle control signal;

Adjust the duty cycle data of the first switch tube and the duty cycle data of the second switch tube according to the duty cycle control signal, so that the sum of the first electrical signal output by the first output terminal and the second electrical signal output by the second output terminal The ratio of the signal sum is equal to the preset electrical signal ratio.

The embodiments of the present application have the following beneficial effects:

A multi-channel resonant conversion circuit and a multi-channel output control method based on the multi-channel resonant conversion circuit disclosed in the embodiments of the present application, wherein the circuit includes a first switch tube, a second switch tube, a resonance circuit, a transformer, and at least one output The circuit group and the control circuit, wherein the first switch tube is connected to the second switch tube, the first switch tube and the second switch tube are both connected to the resonant circuit, the transformer includes a primary winding and at least one secondary winding pair, the primary winding Connected to the resonance circuit, at least one secondary winding pair is connected to at least one output circuit group, each output circuit group in the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal, and the third output terminal Connected with the control circuit, the control circuit is respectively connected with the first switching tube and the second switching tube, the control circuit is used to control the operating frequency of the first switching tube and the operating frequency of the second switching tube, so that the first output terminal outputs the first The sum of the electrical signal and the sum of the second electrical signal output from the second output terminal is equal to the preset total value of the electrical signal, and the control circuit is also used to control the duty cycle data of the first switching tube and the second switching tube. The size of the duty cycle data is such that the ratio of the sum of the first electrical signal output from the first output terminal to the sum of the second electrical signal output from the second output terminal is equal to the preset electrical signal ratio. Based on the embodiment of the present application, the operating frequency of the first switching tube and the operating frequency of the second switching tube are controlled by the control circuit, so that the first output terminal and the second output terminal constantly output electrical signals according to a preset ratio, and the total output electrical signals are The value is equal to the total value of the preset electrical signal, which can achieve the technical effect of multiple outputs of the same driver at the same time.

Description of the drawings

In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appendix in the following description The drawings are only some embodiments of the application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the present application;

2 is a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the present application;

Fig. 3 is a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the present application;

4 is a partial waveform diagram of the duty cycle data D1 of the first switching tube and the duty cycle data D2 of the second switching tube provided by an embodiment of the present application;

Fig. 5 is a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the present application;

6 is a partial waveform diagram of the duty cycle data D1 of the first switching tube and the duty cycle data D2 of the second switching tube provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of a multiple output control method provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiment is only one embodiment of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The “embodiment” referred to herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present application. In the description of the embodiments of this application, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Quantity. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, circuits and methods including a series of steps or devices are not necessarily limited to those clearly listed steps or devices, and Yes may include other steps or devices that are not clearly listed or are inherent to these circuits and methods.

Please refer to FIG. 1, which shows a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the application. The circuit shown in the figure includes a first switching tube 1, a second switching tube 2, a resonance circuit 3, and a transformer 4. At least one output circuit group 5 and control circuit 6, wherein the first switch tube 1 is connected to the second switch tube 2, the first switch tube 1 and the second switch tube 2 are both connected to the resonant circuit 3, and the transformer 4 includes the primary side Winding 41 and at least one secondary winding pair 42, the primary winding 41 is connected to the resonance circuit 3, at least one secondary winding pair 42 is connected to at least one output circuit group 5, and each output circuit group in the at least one output circuit group 5 has The first output terminal 51, the second output terminal 52 and the third output terminal 53, the third output terminal 53 is connected to the control circuit 6, and the control circuit 6 is respectively connected to the first switch tube 1 and the second switch tube 2, and the control circuit 6 Used to control the operating frequency of the first switching tube 1 and the operating frequency of the second switching tube 2, so that the sum of the first electrical signal output by the first output terminal 51 and the sum of the second electrical signal output by the second output terminal 52 And the total value of the preset electrical signal, and the control circuit 6 is also used to control the duty cycle data of the first switch tube 1 and the duty cycle data of the second switch tube 2, so that the output of the first output terminal 51 The ratio of the sum of the first electrical signal and the sum of the second electrical signal output from the second output terminal 52 is equal to the preset electrical signal ratio.

Using the multi-channel resonant conversion circuit provided by the embodiment of the application, the operating frequency of the first switching tube and the operating frequency of the second switching tube are controlled by the control circuit, so that the first output terminal and the second output terminal are constantly output according to a preset ratio Electrical signal, and the total value of the output electrical signal is equal to the total value of the preset electrical signal, which can achieve the technical effect of multiple outputs of the same driver at the same time.

Based on the schematic circuit diagram of the multi-channel resonant conversion circuit provided in FIG. 1, a specific implementation manner of the multi-channel resonant conversion circuit is introduced below. Specifically, FIG. 2 shows a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the application. The figure includes a first switching tube 1, a second switching tube 2, a resonance circuit 3, a transformer 4, at least one output circuit group 5 and a control circuit 6. Among them, the first switching tube 1 is connected to the second switching tube 2, and the first switching tube 1 is connected to the second switching tube 2. The switching tube 1 and the second switching tube 2 are both connected to the resonant circuit 3. The transformer 4 includes a primary winding 41 and at least one secondary winding pair 42. The primary winding 41 is connected to the resonant circuit 3, and at least one secondary winding pair 42 is connected to At least one output circuit group 5 is connected. Each output circuit group in the at least one output circuit group 5 has a first output terminal 51, a second output terminal 52, and a third output terminal 53, and the third output terminal 53 is connected to the control circuit 6, The control circuit 6 is respectively connected to the first switch tube 1 and the second switch tube 2. The control circuit 6 is used to control the operating frequency of the first switch tube 1 and the operating frequency of the second switch tube 2, so that the output of the first output terminal 51 The sum of the first electrical signal and the sum of the second electrical signal output from the second output terminal 52 can be output constantly, and the sum of the first electrical signal output from the first output terminal 51 and the second electrical signal output from the second output terminal 52 The sum of the electrical signals is equal to the total value of the preset electrical signals, and the control circuit 6 is also used to control the duty cycle data of the first switching tube 1 and the duty cycle data of the second switching tube 2, so that the first The ratio of the sum of the first electrical signal output by the output terminal 51 and the sum of the second electrical signal output by the second output terminal 52 is equal to the preset electrical signal ratio.

In the embodiment of the present application, the control circuit 6 includes a drive generation circuit 61, a voltage-controlled oscillation circuit 62, a duty cycle control circuit 63, and an operational amplifier circuit 64. The operational amplifier circuit 64 is connected to the voltage-controlled oscillation circuit 62, and the operational amplifier circuit 64 is used to determine the feedback electrical signal according to the difference between the sum of the sum of the first electrical signal output by the first output terminal 51 and the sum of the second electrical signal output by the second output terminal 52 and the total value of the preset electrical signal, voltage control The oscillating circuit 62 is connected to the driving generating circuit 61. The voltage-controlled oscillating circuit 62 is used to generate a frequency control signal according to the feedback electrical signal, and the driving generating circuit 61 is used to control the operating frequency of the first switching tube 1 and the second switching tube according to the frequency control signal. 2, the duty cycle control circuit 63 is connected to the drive generation circuit 61, the duty cycle control circuit 63 is used to generate a duty cycle control signal, and the drive generation circuit is also used to control the first switch tube according to the duty cycle control signal The duty cycle data of 1 and the duty cycle data of the second switch tube 2 further control the ratio of the sum of the first electrical signal output by the first output terminal 51 and the sum of the second electrical signal output by the second output terminal 52, Make the ratio equal to the preset electrical signal ratio.

Specifically, the control circuit 6 detects the total current value output by the first output terminal 51 and the second output terminal 52, and compares the total current value with the total value of the preset electrical signal, that is, compares the total current value with the expected value _Vref , and amplifies the operation. The circuit 64 determines the feedback electrical signal according to the difference between the total current value and the expected value. The feedback electrical signal is input to the voltage-controlled oscillation circuit 62. The voltage-controlled oscillation circuit 62 generates a frequency control signal according to the feedback electrical signal, so that the first switch tube 1 works The frequency and the operating frequency of the second switch tube 2 change with the change of the feedback electrical signal, thereby making the total current equal to the expected value.

Among them, the working frequency of the first switching tube 1 and the working frequency of the second switching tube 2 are equal, and the voltage-controlled oscillation circuit 62 determines the working frequency of the first switching tube 1 and the working frequency of the second switching tube 2 according to the above-mentioned feedback electrical signal. The size of the frequency.

In the embodiment of the present application, the resonance circuit 3 includes an inductor 31 and a capacitor 32. The inductor 31 is connected in series with the capacitor 32, and is connected in series with the primary winding 41 of the transformer 4. Specifically, the second terminal 11 of the first switch tube 1 and the second The first terminal 21 of the switch tube 2 is connected, and the first terminal 21 of the second switch tube 2, the inductor 31, the primary winding 41, the capacitor 32 and the second terminal 22 of the second switch tube 2 are sequentially connected to form a half-bridge circuit.

In the embodiment of the present application, each secondary winding pair in the at least one secondary winding pair 42 described above includes a first secondary winding and a second secondary winding, and the at least one output circuit group 5 described above is Each output circuit group includes a first half-wave rectifier circuit and a second half-wave rectifier circuit. Among them, the first half-wave rectifier circuit is connected with the first secondary winding, the second half-wave rectifier circuit is connected with the second secondary winding, the positive terminal of the first half-wave rectifier circuit is the first output terminal 51, and the second half-wave rectifier circuit is the first output terminal 51. The positive terminal of the rectifier circuit is the second output terminal 52. The negative terminal of the first half-wave rectifier circuit is connected to the negative terminal of the second half-wave rectifier circuit and grounded as a common ground terminal. The negative terminal of the first half-wave rectifier circuit is connected to the second output terminal 52. The negative terminal of the half-wave rectifier circuit is connected to lead to a common negative terminal, that is, the third output terminal 53. In addition, each output circuit group in the at least one output circuit group 5 described above further includes a detection resistor 54 whose first terminal is connected to the common ground terminal, and the second terminal of the detection resistor 54 is connected to the common negative terminal. Connected so that the voltage on the detection resistor 54 is the voltage drop between the common negative terminal and the common ground terminal, and the magnitude of the voltage drop represents the sum of the first electrical signal output from the first output terminal and the second electrical signal output from the second output terminal The size of the sum of the sum.

In the embodiment of the present application, the above-mentioned multi-channel resonant conversion circuit includes at least one output circuit group 5, which may be specifically that the circuit includes N output circuit groups 5, and the transformer 4 includes at least one secondary winding pair 42, which may be specifically that the transformer 4 includes N secondary windings. Side winding pairs 42, wherein N output circuit groups 5 correspond to N secondary winding pairs 42 one-to-one; N is an integer greater than or equal to 2, and N output circuit groups 5 include N-1 adjacent output circuit groups , And includes 2 (N-1) shunt inductor groups. Each of the 2 (N-1) shunt inductor groups includes a first shunt inductor and a second shunt inductor, and the adjacent output circuit group includes a first output circuit group and a second output circuit group. The first shunt inductor The inductor is located in the first half-wave rectifier circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is located in the first half-wave rectifier circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group. In the half-wave rectifier circuit; or; the first shunt inductor is located in the second half-wave rectifier circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is located in the phase corresponding to the shunt inductor group. In the second half-wave rectifier circuit of the second output circuit group adjacent to the output circuit group.

In the embodiment of the present application, the sum of the first electrical signal output by the first output terminal 51 of each output circuit group in the at least one output circuit group 5 described above and each output circuit in the at least one output circuit group 5 The ratio of the sum of the second electrical signals output by the second output terminals 51 of the group is equal to the preset electrical signal ratio.

It should be noted that, in the embodiment of the present application, the circuit includes at least one output circuit group 5, where at least one output circuit group 5 may include one output circuit group 5 or multiple output circuit groups 5; the transformer 4 includes the original The side winding 41 and at least one secondary winding pair 42, wherein the at least one secondary winding pair 42 may include one secondary winding pair 42 or multiple secondary winding pairs 42. Among them, the number of output circuit groups 5 is consistent with the number of secondary winding pairs 42, and the output circuits in the output circuit 5 correspond to the secondary windings in the secondary winding pairs in a one-to-one correspondence. Several optional implementation manners are specifically introduced below.

In an optional implementation manner, as shown in FIG. 3, it is a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the application. The circuit includes an output circuit group 5, and the transformer 4 includes a primary winding 41 and a secondary winding pair 42. The output circuit group 5 includes a first half-wave rectifier circuit and a second half-wave rectifier circuit. The secondary winding pair 42 includes a first secondary winding and a second secondary winding. The first half-wave rectifier circuit is connected to the first secondary winding. , The second half-wave rectifier circuit is connected to the second secondary winding, the positive terminal of the first half-wave rectifier circuit is the first output terminal 51, and the first output terminal 51 is marked as V01; the positive terminal of the second half-wave rectifier circuit is The second output terminal 52, the second output terminal 52 is marked as V02; the negative terminal of the first half-wave rectifier circuit is connected to the negative terminal of the second half-wave rectifier circuit, and the third output terminal 53 is led out, and the third output terminal 53 is marked For V1-.

The operational amplifier circuit in the control circuit 6 is based on the difference between the sum of the first electrical signal output from the first output terminal 51 and the second electrical signal output from the second output terminal 52 and the preset electrical signal total value, that is, the detection resistor 54 The difference between the voltage and the expected value determines the feedback electrical signal. The feedback electrical signal is input into the voltage-controlled oscillator circuit 62. The voltage-controlled oscillator circuit 62 generates a frequency control signal according to the feedback electrical signal and inputs it to the drive generating circuit 61. The drive generating circuit 61 controls the frequency according to the frequency. The signal controls the operating frequency of the first switching tube 1 and the operating frequency of the second switching tube 2 so that the sum of the electrical signal output by the first output terminal 51 and the electrical signal output by the second output terminal 52 is equal to the expected value. In addition, the drive generating circuit adjusts the duty cycle data of the first switch tube 1 and the duty cycle data of the second switch tube 2 according to the duty cycle control signal provided by the duty cycle control circuit, so that the first output terminal 51 outputs The ratio of the first electrical signal to the second electrical signal output by the second output terminal 52 is equal to the preset electrical signal ratio.

Specifically, the preset total current is I=1A, the preset current ratio is I01:I02=3:1, and the sum of the duty cycle data D1 of the first switch tube and the duty cycle data D2 of the second switch tube is 1. . The control circuit 6 adjusts the operating frequency of the first switching tube 1 and the operating frequency of the second switching tube 2 according to the frequency control signal, so that the current value I01 output by the first output terminal 51 and the current value output by the second output terminal 52 are The sum of I02 I01+I02=1A, and the duty cycle data size of the first switch tube 1 and the duty cycle data size of the second switch tube 2 are adjusted so that I01:I02=0.75A:0.25A=3: 1. Among them, the duty cycle data D1 of the first switch tube and the duty cycle data D2 of the second switch tube are shown in FIG. 4, which shows the duty cycle data D1 of the first switch tube and the duty cycle of the second switch tube. Data D2 part of the waveform diagram.

In another optional implementation manner, as shown in FIG. 5, it is a schematic circuit diagram of a multi-channel resonant conversion circuit provided by an embodiment of the application. The circuit includes three output circuit groups 5, and the transformer 4 includes one primary winding 41 and three secondary winding pairs 42. Each of the three output circuit groups 5 includes a first half-wave rectifier circuit and a second half-wave rectifier circuit, and each of the three secondary winding pairs 42 includes a first secondary winding and a first secondary winding. Two secondary windings; the first half-wave rectifier circuit in each output circuit group 5 is connected to the first secondary winding in the corresponding secondary winding pair, and the second half-wave rectifier circuit in each output circuit group 5 is connected to The second secondary winding in the corresponding secondary winding pair is connected, and the formed first output terminal 51 is respectively marked as V01, V03 and V05, and the formed second output terminal 52 is respectively marked as V02, V04 and V06. Among them, V01 and V02 are the signs of the first output terminal 51 and the second output terminal 52 of the same output circuit group. The negative terminal of the first half-wave rectifier circuit and the negative terminal of the second half-wave rectifier circuit in the output circuit group are Terminal is connected, and leads to the third output terminal 53, the third output terminal 53 is marked as V1-; V03 and V04 are the marks of the first output terminal 51 and the second output terminal 52 of the same output circuit group. The negative terminal of the first half-wave rectifier circuit is connected to the negative terminal of the second half-wave rectifier circuit, and a third output terminal 53, the third output terminal 53 is marked as V2-; V05 and V06 are in the same output circuit group The first output terminal 51 and the second output terminal 52 are marked. The negative terminal of the first half-wave rectifier circuit in the output circuit group is connected to the negative terminal of the second half-wave rectifier circuit, and the third output terminal 53 is led out. The three output terminal 53 is marked as V3-.

The above-mentioned three output circuit groups 5 include two adjacent output circuit groups and four shunt inductor groups. Each of the four shunt inductor groups L1, L2, L3, and L4 includes a first shunt inductor and a second shunt inductor. Specifically, the first shunt inductor L1-1 of the shunt inductor group L1 is located at the first output end V01, the second shunt inductor L1-2 of the shunt inductor group L1 is located at the first output terminal V03; similarly, the first shunt inductor L2-1 of the shunt inductor group L2 is located at the second output terminal V02, and the second shunt inductor group L2 is located at the second output terminal V02. The shunt inductor L2-2 is located at the second output terminal V04; the first shunt inductor L3-1 of the shunt inductor group L3 is located at the first output terminal V03, and the second shunt inductor L3-2 of the shunt inductor group L3 is located at the first output terminal V05; The first shunt inductor L4-1 of the shunt inductor group L4 is located at the second output terminal V04, and the second shunt inductor L4-2 of the shunt inductor group L4 is located at the second output terminal V06.

The operational amplifying circuit in the control circuit 6 is based on the difference between the sum of the sum of the first electrical signal output by the first output terminal 51 and the sum of the second electrical signal output by the second output terminal 52 and the preset total value of the electrical signal, namely The difference between the voltage on the detection resistor 54 and the expected value determines the feedback electrical signal. The feedback electrical signal is input into the voltage-controlled oscillation circuit 62. The voltage-controlled oscillation circuit 62 generates a frequency control signal according to the feedback electrical signal and inputs it to the drive generating circuit 61. The drive generating circuit 61 Control the operating frequency of the first switching tube 1 and the operating frequency of the second switching tube 2 according to the frequency control signal, so that the sum of the electrical signals output by the first output terminal 51 and the sum of the electrical signals output by the second output terminal 52 Equal to the expected value. In addition, the drive generating circuit 61 also adjusts the duty cycle data of the first switch tube 1 and the duty cycle data of the second switch tube 2 according to the duty cycle control signal provided by the duty cycle control circuit, so that the first output terminal 51 The ratio of the sum of the first electrical signals output to the sum of the second electrical signals output from the second output terminal 52 is equal to the preset electrical signal ratio.

Specifically, the preset total current is I=1A, the preset current ratio is I01:I02=1:1, and the sum of the duty cycle data D1 of the first switch tube and the duty cycle data D2 of the second switch tube is 1. . The control circuit 6 adjusts the operating frequency of the first switching tube 1 and the operating frequency of the second switching tube 2 according to the frequency control signal, so that the sum of the current value I01 output by the first output terminal 51 and the current output by the second output terminal 52 The value is I02=1A, and I01:I02=0.5A:0.5A=1:1. Among them, the duty cycle data D1 of the first switch tube and the duty cycle data D2 of the second switch tube are shown in Figures 6, 4, which show the duty cycle data D1 of the first switch tube and the duty cycle data of the second switch tube. Schematic diagram of the D2 part of the empty data.

Among them, the sum of the currents output by the first output terminal 51 is I011+I013+I015=I01, and the sum of the currents output by the second output terminal 52 is I022+I024+I026=I02. Among them, the ratio of the currents I011, I013, and I015 output by the first output terminal 51 is realized by the shunt inductors connected in series between the output terminals of the output electrical signals V01, V03, and V05. For example, if I011:I013:I015=2:1: 1, then L1-1:L1-2=1:2, L3-1:L3-2=1:1.

The multi-channel resonant conversion circuit provided by the embodiment of the application is adopted, wherein the circuit includes a first switch tube, a second switch tube, a resonance circuit, a transformer, at least one output circuit group and a control circuit, wherein the first switch tube Connected to the second switching tube, the first switching tube and the second switching tube are both connected to the resonant circuit, the transformer includes a primary winding and at least one secondary winding pair, the primary winding is connected to the resonant circuit, and at least one secondary winding pair is connected to the resonant circuit. At least one output circuit group is connected. Each output circuit group in the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal. The third output terminal is connected to the control circuit, and the control circuit is respectively connected to the first switch. The control circuit is used to control the operating frequency of the first switching tube and the operating frequency of the second switching tube, so that the sum of the first electrical signal output by the first output terminal and the second output terminal output The sum of the two electrical signals is equal to the total value of the preset electrical signals. Based on the embodiment of the present application, the operating frequency of the first switching tube and the operating frequency of the second switching tube are controlled by the control circuit, so that the first output terminal and the second output terminal constantly output electrical signals according to a preset ratio, and the total output electrical signals are The value is equal to the total value of the preset electrical signal, which can achieve the technical effect of multiple outputs of the same driver at the same time.

The following describes a specific embodiment of a multiple output control method based on a multiple resonant converter circuit based on the multiple resonant converter circuit provided in FIG. 1. FIG. 7 is a multiple output control provided by an embodiment of the present application. A schematic flow diagram of the method. This specification provides the method operation steps as shown in the embodiments or flowcharts, but more or less operation steps may be included based on conventional or uninvented labor. The order of steps listed in the embodiment is only one of the many execution orders, and does not represent the only execution order. In actual execution, it can be executed sequentially or in parallel according to the method shown in the embodiment or the drawings (for example, parallel processing). Processor or multi-threaded environment). The details are shown in Figure 7.

The method is based on a multi-channel resonant conversion circuit. The multi-channel resonant conversion circuit includes a first switching tube 1, a second switching tube 2, a resonance circuit 3, a transformer 4, at least one output circuit group 5 and a control circuit 6, wherein the first The switching tube 1 is connected to the second switching tube 2, and the first switching tube 1 and the second switching tube 2 are both connected to the resonant circuit 3. The transformer 4 includes a primary winding 41 and at least one secondary winding pair 42. The primary winding 41 and The resonance circuit 3 is connected, at least one secondary winding pair 42 is connected to at least one output circuit group 5, and each output circuit group in the at least one output circuit group 5 has a first output terminal 51, a second output terminal 52, and a third output terminal 53. The third output terminal 53 is connected to the control circuit 6. The control circuit 6 is respectively connected to the first switch tube 1 and the second switch tube 2. The control circuit 6 is used to control the operating frequency of the first switch tube 1 and the second switch tube The operating frequency of 2 is such that the sum of the first electrical signal output by the first output terminal 51 and the sum of the second electrical signal output by the second output terminal 52 is equal to the preset total value of the electrical signal, and the control circuit 6 also uses To control the size of the duty cycle data of the first switch tube 1 and the duty cycle data of the second switch tube 2, so that the sum of the first electrical signal output by the first output terminal 51 and the second output terminal 52 output The ratio of the sum of the electrical signals is equal to the preset ratio of the electrical signals.

The method includes:

S701: Receive the sum of the first electrical signal output by the first output terminal 51 of each output circuit group in at least one output circuit group and the sum of the second electrical signal output by the second output terminal 52 of each output circuit group.

S703: Determine the total value of the electrical signal according to the sum of the first electrical signal and the sum of the second electrical signal.

S705: Adjust the operating frequency of the first switching tube and the operating frequency of the second switching tube according to the difference between the total value of the electrical signal and the total value of the preset electrical signal, so that the sum of the first electrical signal output by the first output terminal 51 The sum of the second electrical signals output by the second output terminal 52 is equal to the preset total value of the electrical signals.

In the embodiment of the present application, the above method further includes:

Receive duty cycle control signal;

The duty cycle data of the first switch tube and the duty cycle data of the second switch tube are adjusted according to the duty cycle control signal, so that the sum of the first electrical signal output by the first output terminal 51 and the second output terminal 52 output The ratio of the sum of the two electrical signals is equal to the preset electrical signal ratio.

The method and circuit embodiment in the embodiment of the application are based on the same application concept.

It can be seen from the above-mentioned embodiment of the multiple resonant conversion circuit or the multiple output control method based on the multiple resonant conversion circuit provided in the present application that the circuit in the present application includes a first switch tube, a second switch tube, a resonant circuit, a transformer, at least An output circuit group and a control circuit, wherein the first switching tube is connected to the second switching tube, the first switching tube and the second switching tube are both connected to the resonant circuit, and the transformer includes a primary winding and at least one secondary winding pair. The side winding is connected to the resonance circuit, and at least one secondary winding pair is connected to at least one output circuit group. Each output circuit group in the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal. The output terminal is connected with the control circuit, the control circuit is respectively connected with the first switching tube and the second switching tube, the control circuit is used to control the operating frequency of the first switching tube and the operating frequency of the second switching tube, so that the output of the first output terminal The sum of the sum of the first electrical signal and the sum of the second electrical signal output from the second output terminal is equal to the preset total value of the electrical signal, and the control circuit 6 is also used to control the duty cycle data of the first switch tube 1 and the The size of the duty cycle data of the second switch tube 2 is such that the ratio of the sum of the first electrical signal output from the first output terminal 51 and the sum of the second electrical signal output from the second output terminal 52 is equal to the preset electrical signal ratio. Based on the embodiment of the present application, the operating frequency of the first switching tube and the operating frequency of the second switching tube are controlled by the control circuit, so that the first output terminal and the second output terminal constantly output electrical signals according to a preset ratio, and the output electrical signals are total The value is equal to the total value of the preset electrical signal, which can achieve the technical effect of multiple outputs of the same driver at the same time.

In the present invention, unless otherwise clearly defined and limited, the terms "connection" and other terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a whole; it can be a mechanical connection or It is an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be a connection between two components or an interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

It should be noted that the sequence of the above embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments, and the above specification describes specific embodiments, and other embodiments are also within the scope of the appended claims. Inside. In some cases, the actions or steps described in the claims can be executed in the order in different embodiments and can achieve expected results. In addition, the processes depicted in the drawings do not necessarily require a specific order or connection order to achieve the desired result. In some embodiments, multi-task parallel processing is also possible or may be advantageous.

The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

The above are the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered This is the protection scope of the present invention.

Claims

A multi-channel resonant conversion circuit, which is characterized by comprising: a first switch tube, a second switch tube, a resonance circuit, a transformer, at least one output circuit group, and a control circuit;

The first switching tube is connected to the second switching tube, and both the first switching tube and the second switching tube are connected to the resonance circuit;

The transformer includes a primary winding and at least one secondary winding pair, the primary winding is connected to the resonance circuit, and the at least one secondary winding pair is connected to the at least one output circuit group;

Each output circuit group in the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal;

The third output terminal is connected to the control circuit;

The control circuit is respectively connected with the first switch tube and the second switch tube, and the control circuit is used to control the operating frequency of the first switch tube and the operating frequency of the second switch tube so that all The sum of the first electrical signal output by the first output terminal and the sum of the second electrical signal output by the second output terminal is equal to the preset total value of the electrical signal, and the control circuit is also used to control the The size of the duty cycle data of the first switch tube and the duty cycle data of the second switch tube is such that the sum of the first electrical signal output by the first output terminal and the second output terminal output The ratio of the sum of the electrical signals is equal to the preset ratio of the electrical signals.
The circuit according to claim 1, wherein the control circuit comprises: a drive generating circuit, a voltage controlled oscillation circuit, a duty ratio control circuit, and an operational amplifier circuit;

The operational amplifier circuit is connected to the voltage-controlled oscillation circuit, and the operational amplifier circuit is configured to determine the sum of the first electrical signal output from the first output terminal and the second electrical signal output from the second output terminal. The difference between the sum of the sum and the total value of the preset electrical signal determines the feedback electrical signal;

The voltage-controlled oscillation circuit is connected to the drive generating circuit, and the voltage-controlled oscillation circuit is used to generate a frequency control signal according to the feedback electrical signal;

The drive generating circuit is used to control the operating frequency of the first switching tube and the operating frequency of the second switching tube according to the frequency control signal;

The duty ratio control circuit is connected to the drive generating circuit, and the duty ratio control circuit is used to generate a duty ratio control signal;

The drive generating circuit is also used to control the duty cycle data of the first switch tube and the duty cycle data of the second switch tube according to the duty cycle control signal, thereby controlling the output of the first output terminal The ratio of the sum of the first electrical signal and the sum of the second electrical signal output from the second output terminal is such that the ratio is equal to the preset electrical signal ratio.
The circuit according to claim 1, wherein the resonant circuit includes an inductor and a capacitor;

The second end of the first switch tube or the first end of the second switch tube are sequentially connected to the inductor, the primary winding, the capacitor and the second end of the second switch tube to form a half bridge Circuit.
The circuit according to claim 1, wherein each secondary winding pair in the at least one secondary winding pair includes a first secondary winding and a second secondary winding;

Each output circuit group in the at least one output circuit group includes a first half-wave rectifier circuit and a second half-wave rectifier circuit, the first half-wave rectifier circuit is connected to the first secondary winding, and the second half-wave rectifier circuit is connected to the first secondary winding. The half-wave rectifier circuit is connected to the second secondary winding;

The positive terminal of the first half-wave rectifier circuit is a first output terminal, the positive terminal of the second half-wave rectifier circuit is a second output terminal, and the negative terminal of the first half-wave rectifier circuit is connected to the second half-wave rectifier circuit. The negative terminal of the wave rectifier circuit is connected and grounded, and the negative terminal of the first half-wave rectifier circuit is connected with the negative terminal of the second half-wave rectifier circuit to lead to a third output terminal.
The circuit according to claim 4, wherein each output circuit group in the at least one output circuit group further comprises a detection resistor;

The first end of the detection resistor is connected to the negative end of the first half-wave rectifier circuit, the first end of the detection resistor is connected to the negative end of the second half-wave rectifier circuit, and the first end of the detection resistor is connected to the negative end of the second half-wave rectifier circuit. The two ends are connected with the third output end.
The circuit according to claim 1, wherein the circuit includes N output circuit groups, the transformer includes N secondary winding pairs, and the N output circuit groups and the N secondary winding pairs One-to-one correspondence; the N is an integer greater than or equal to 2, and the N output circuit groups include N-1 adjacent output circuit groups and 2 (N-1) shunt inductor groups.
7. The circuit according to claim 6, wherein the shunt inductor group includes a first shunt inductor and a second shunt inductor; the adjacent output circuit group includes a first output circuit group and a second output circuit group;

The first shunt inductor is located in the first half-wave rectifier circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is located adjacent to the shunt inductor group. In the first half-wave rectifier circuit of the second output circuit group of the output circuit group; or; the first shunt inductor is located in the second half wave of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group In the rectifier circuit, the second shunt inductor is located in the second half-wave rectifier circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group.
The circuit according to claim 2, wherein the sum of the first electrical signal output by the first output terminal of each output circuit group in the at least one output circuit group and each output circuit group in the at least one output circuit group are The ratio of the sum of the second electrical signals output by the second output terminals of the output circuit groups is equal to the preset electrical signal ratio.
A multi-channel output control method based on a multi-channel resonant conversion circuit is characterized in that it comprises:

Receiving the sum of the first electrical signal output by the first output terminal of each output circuit group in at least one output circuit group and the sum of the second electrical signal output by the second output terminal of each output circuit group;

Determining the total value of the electrical signal according to the sum of the first electrical signal and the sum of the second electrical signal;

Adjust the operating frequency of the first switching tube and the operating frequency of the second switching tube according to the difference between the total value of the electrical signal and the total value of the preset electrical signal, so that the sum of the first electrical signal output by the first output terminal The sum of the sum of the second electrical signal output from the second output terminal is equal to the total value of the preset electrical signal.
The method according to claim 9, wherein the method further comprises:

Receive duty cycle control signal;

Adjust the duty cycle data of the first switch tube and the duty cycle data of the second switch tube according to the duty cycle control signal, so that the sum of the first electrical signal output by the first output terminal The ratio of the sum of the second electrical signals output from the second output terminal is equal to the preset electrical signal ratio.